US20100147433A1 - Self-supporting pneumatic tire - Google Patents

Self-supporting pneumatic tire Download PDF

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Publication number
US20100147433A1
US20100147433A1 US12/333,437 US33343708A US2010147433A1 US 20100147433 A1 US20100147433 A1 US 20100147433A1 US 33343708 A US33343708 A US 33343708A US 2010147433 A1 US2010147433 A1 US 2010147433A1
Authority
US
United States
Prior art keywords
tire
insert
bead
ply
shore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US12/333,437
Other languages
English (en)
Inventor
Thierry Paul-Marie Gabriel Koeune
Tony Raymond Gery Deroo
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US12/333,437 priority Critical patent/US20100147433A1/en
Priority to EP09177572.6A priority patent/EP2196333B1/de
Priority to JP2009277626A priority patent/JP2010137852A/ja
Priority to ZA200908859A priority patent/ZA200908859B/en
Priority to CN200910258363.4A priority patent/CN101746226A/zh
Publication of US20100147433A1 publication Critical patent/US20100147433A1/en
Abandoned legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C15/00—Tyre beads, e.g. ply turn-up or overlap
    • B60C15/0009—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion
    • B60C15/0018—Tyre beads, e.g. ply turn-up or overlap features of the carcass terminal portion not folded around the bead core, e.g. floating or down ply
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
    • B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
    • B60C17/0018—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts two or more inserts in each sidewall portion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
    • B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
    • B60C2017/0054—Physical properties or dimensions of the inserts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60C—VEHICLE TYRES; TYRE INFLATION; TYRE CHANGING; CONNECTING VALVES TO INFLATABLE ELASTIC BODIES IN GENERAL; DEVICES OR ARRANGEMENTS RELATED TO TYRES
    • B60C17/00—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor
    • B60C17/0009—Tyres characterised by means enabling restricted operation in damaged or deflated condition; Accessories therefor comprising sidewall rubber inserts, e.g. crescent shaped inserts
    • B60C2017/0054—Physical properties or dimensions of the inserts
    • B60C2017/0063—Modulus; Hardness; Loss modulus or "tangens delta"

Definitions

  • the present invention is directed to a pneumatic radial tire capable of running in conditions wherein the tire is operated at less than conventional inflation pressure.
  • Self-supporting run-flat tires have been commercialized for many years.
  • the primary characteristic of such tires is an increase in the cross-sectional thickness of the sidewalls to strengthen the sidewalls.
  • These tires when operated in the uninflated condition, place the reinforcing sidewall inserts in compression. Due to the large amounts of rubber required to stiffen the sidewall members, heat build-up is a major factor in tire failure. This is especially true when the tire is operated for prolonged periods at high speeds in the uninflated condition.
  • U.S. Pat. No. 5,368,082 teaches the employment of special sidewall inserts to improve stiffness. Approximately six additional pounds of weight per tire are required to support an 800 lb load in an uninflated tire. The earliest commercial use of such runflat tires were used on a high performance vehicle and had a very low aspect ratio. The required supported weight for an uninflated luxury car tire, having an aspect ratios in the 55% to 65% range or greater, approximates 1400 lbs load. Such higher loads for larger run-flat tires meant that the sidewalls and overall tire had to be stiffened to the point of compromising ride. luxury vehicle owners simply will not sacrifice ride quality for runflat capability. The engineering requirements have been to provide a runflat tire with no loss in ride or performance.
  • the present invention is directed to a self-supporting tire. More specifically, the tire has a carcass, a tread, and a belt reinforcing structure located radially outward of the carcass and radially inward of the tread.
  • the carcass is comprised of a reinforcing ply extending between a pair of bead portions, a pair of sidewalls, each sidewall located radially outward of one of the pair of bead portions, and a pair of inserts located in each sidewall.
  • the first insert is positioned between an innerliner and the first reinforcing ply, and the second insert is positioned axially outward of the first reinforcing ply.
  • “Apex” means an elastomeric filler located radially above the bead core and between the plies and the turnup ply.
  • Annular means formed like a ring.
  • “Circumferential” means lines or directions extending along the perimeter of the surface of the annular tire parallel to the Equatorial Plane (EP) and perpendicular to the axial direction.
  • Design rim means a rim having a specified configuration and width.
  • the design rim and design rim width are as specified by the industry standards in effect in the location in which the tire is made.
  • the design rims are as specified by the Tire and Rim Association.
  • the rims are as specified in the European Tyre and Rim Technical Organization—Standards Manual and the term design rim means the same as the standard measurement rims.
  • the standard organization is The Japan Automobile Tire Manufacturer's Association.
  • Design rim width is the specific commercially available rim width assigned to each tire size.
  • “Self-supporting run-flat” means a type of tire that has a structure wherein the tire structure alone is sufficiently strong to support the vehicle load when the tire is operated in the uninflated condition for limited periods of time and speed, the sidewall and internal surfaces of the tire not collapsing or buckling onto themselves, without requiring any internal devices to prevent the tire from collapsing.
  • “Sidewall insert” means elastomer or cord reinforcements located in the sidewall region of a tire; the insert being in addition to the carcass reinforcing ply and outer sidewall rubber that forms the outer surface of the tire.
  • “Spring Rate” means the stiffness of tire expressed as the slope of the load deflection curve at a given pressure.
  • “Vertical Deflection” means the amount that a tire deflects under load.
  • FIG. 1 is a cross-sectional configuration of one half of a self-supporting run-flat tire
  • FIG. 1 illustrates a tire 10 of the present invention that is designed to be operable should a loss of air pressure occur.
  • the tire 10 has a radially outer ground engaging tread 12 , and a belt structure 14 located in the crown portion of the tire underneath the tread.
  • the belt structure 14 contains one or more belts with an optional shoulder overlay 16 to protect the belts at the shoulder portion of the crown.
  • the tire 10 further comprises a pair of sidewall portions 18 which extend radially inwards from the tread and terminate in a bead region 20 .
  • Each bead region further comprises a bead wire 55 having any desired shape.
  • the bead region 20 may further include an optional first apex 60 and an optional second apex 70 as described in more detail, below.
  • the bead portion may also include other optional and non-illustrated elements such as flippers, chippers, toe guards and chafers.
  • the tire 10 of the present invention further includes a carcass which includes an inner liner 24 which is air impervious, and extends from one bead region 20 to the other.
  • the carcass also includes a first reinforcing ply 30 and may also include an optional second reinforcing ply 34 .
  • the first reinforcing ply 30 is the radially innermost ply and extends under the crown portion of the tire and axially outwards of a first insert 40 in the upper shoulder area of the tire.
  • the first insert 40 is located in the upper shoulder area near the crown, and is located between the innerliner 24 and the first reinforcing ply 30 .
  • the first reinforcing ply 30 extends axially outward and adjacent the axially outer portion 42 of the first insert 40 .
  • the first reinforcing ply transitions from an axially outward position in the upper shoulder area of the tire to an axially inward position in the mid to lower portion of the sidewall 18 .
  • the first reinforcing ply 30 functions as a dividing line between the first insert 40 and a second insert 50 .
  • the first reinforcing ply extends radially inward along the axially inward surface 52 of a second insert 50 .
  • the first and second insert are shaped and positioned to modify the first reinforcing plyline so that the first reinforcing ply is loaded in tension whether the tire is inflated or deflated.
  • the tension loading is thus minimized in the inserts 40 , 50 , as the first reinforcing ply carries the load. Details of the first and second insert 40 , 50 are described, below.
  • the first reinforcing ply 30 is located between a portion of the inner liner 24 and the second insert 50 , and preferably extends axially inward of the second insert 50 .
  • the reinforcing ply is also axially inward of the bead wire in the bead portion 20 of the tire.
  • the first reinforcing ply 30 is anchored to the bead region 20 by any desired method known to those skilled in the art.
  • One method of anchoring the first reinforcing ply 30 is to wrap the ply 30 around the bead and end in a turn up 32 .
  • the turn up 32 preferably extends past the tip 62 of apex 60 and abuts a portion of a second reinforcing ply 34 .
  • the second optional reinforcing ply 34 is located radially outward and adjacent the first ply underneath the crown portion of the tire and in the upper shoulder area.
  • a radially outer portion 53 of a second insert 50 separates the first reinforcing ply from the second reinforcing ply.
  • the first reinforcing ply extends along the axially inner edge 52 of the second insert while the second reinforcing ply extends along the axially outer edge 54 of the second insert 50 .
  • the second reinforcing ply 34 is located between the second insert 50 and a second apex 70 .
  • the second reinforcing ply has a terminal end 36 that may terminate in the vicinity of bead wire 55 .
  • the terminal end 36 is located axially outward of the down portion 37 of the first reinforcing ply and radially outward of the bead wire 55 .
  • the terminal end 36 is located between the apex 60 and the insert 50 .
  • the terminal end 36 of the second reinforcing ply does not wrap around either bead nor is it anchored to the bead 55 , and is considered to be a floating ply because it is not anchored around each bead.
  • the terminal end 36 may be anchored to the bead by wrapping around the bead or via a reverse turn-up.
  • the first bead apex 60 is located radially outward of the bead core 55 and between the lower end of the second reinforcing ply 34 and the turn-up portion 32 of the first reinforcing ply.
  • the first bead apex 60 preferably has a triangular shape with a height that ranges from about 0.3 to about 3 times the bead height, and more preferably about 1.5 to about 2 times the bead height.
  • the first apex 60 is shaped and sized to keep tension in the ply turnup 32 for both the inflated and deflated tire conditions.
  • the bead apex 60 is typically formed of an elastomer or rubber.
  • the first bead apex 60 is optional, and may be replaced by a pentagonal bead (not shown).
  • the tire of this embodiment further includes a second, optional bead apex 70 .
  • the second optional bead apex 70 is located adjacent the second insert with the lower portion of the second ply located therebetween.
  • the second apex 70 has a radially inner end 72 located near the radially outer portion of the bead wire 55 , and a radially outer end 74 that extends in the range from about 1 ⁇ 3 to about 1 ⁇ 2 the height of the sidewall.
  • the second bead apex 70 is typically formed of an elastomer or rubber having a Shore A hardness at 23 degrees C. in the range of about 60 to about 85, more preferably about 65 to about 80.
  • the second apex 70 is shaped and sized to keep tension in the ply turnup 32 for both the inflated and deflated tire conditions.
  • the first insert 40 is curved and shaped so that the first ply 34 is kept under tension in both the inflated and the deflated conditions.
  • the insert 40 preferably has a maximum thickness B at a location between the tread edge and the radial location of the upper sidewall of the tire. B ranges from about 5 mm to about 20 mm and occurs at a radial height of about 2 ⁇ 3 of the section height.
  • the first insert 40 is typically formed of an elastomer or rubber having a Shore A hardness at 23 degrees C. in the range of about 50 to about 75, more preferably about 55 to about 65.
  • the function of the insert 40 is to stiffen/support the sidewall 18 of the tire 10 when the tire 10 is operated at reduced or insignificant inflation pressure, and to keep the ply under tension when the tire is at reduced or insignificant inflation pressure. If the ply is kept in tension, the tension load of the inserts 40 , 50 are minimized.
  • the second insert 50 has an asymmetrical shape.
  • the radially outer end 53 of the second insert overlaps with the first insert 40 .
  • the curvature of the axially inner surface 54 of the second insert is concave at the radially outer portion and convex in the inner surface 56 of the radially inner portion.
  • the second insert has a different shore A hardness than the first insert 40 , and it is preferred that the second insert be stiffer relative to the first insert. Thus it is preferred that the second insert has a higher relative shore A hardness than the first insert 40 .
  • the inserts 40 , 50 are elastomeric in nature and may have material properties selected to enhance inflated ride performance while promoting the tire's run-flat durability.
  • the inserts 40 , 50 if desired, may also be individually reinforced with cords or short fibers.
  • the inserts 40 , 50 and apexes 60 , 70 may have a tangent delta in the range of about 0.02 to about 0.06, and more preferably in the range of about 0.025 and 0.045.
  • the tangent delta is measured under shear at 70 degrees C., and under a deformation of 6%, using a Metravib analyzer at a frequency of 7.8 Hertz.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Tires In General (AREA)
US12/333,437 2008-12-12 2008-12-12 Self-supporting pneumatic tire Abandoned US20100147433A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US12/333,437 US20100147433A1 (en) 2008-12-12 2008-12-12 Self-supporting pneumatic tire
EP09177572.6A EP2196333B1 (de) 2008-12-12 2009-12-01 Selbsttragender Luftreifen
JP2009277626A JP2010137852A (ja) 2008-12-12 2009-12-07 最適化されたプライラインを有する自立型空気入りタイヤ
ZA200908859A ZA200908859B (en) 2008-12-12 2009-12-11 Self-supporting pneumatic tire
CN200910258363.4A CN101746226A (zh) 2008-12-12 2009-12-14 自支撑式充气轮胎

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/333,437 US20100147433A1 (en) 2008-12-12 2008-12-12 Self-supporting pneumatic tire

Publications (1)

Publication Number Publication Date
US20100147433A1 true US20100147433A1 (en) 2010-06-17

Family

ID=42083891

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/333,437 Abandoned US20100147433A1 (en) 2008-12-12 2008-12-12 Self-supporting pneumatic tire

Country Status (5)

Country Link
US (1) US20100147433A1 (de)
EP (1) EP2196333B1 (de)
JP (1) JP2010137852A (de)
CN (1) CN101746226A (de)
ZA (1) ZA200908859B (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5494601B2 (ja) * 2011-09-28 2014-05-21 横浜ゴム株式会社 空気入りランフラットタイヤ
EP3865315B1 (de) * 2018-11-16 2023-10-04 The Yokohama Rubber Co., Ltd. Notlaufreifen
JP7151627B2 (ja) * 2019-05-27 2022-10-12 横浜ゴム株式会社 空気入りタイヤ
JP2020203574A (ja) * 2019-06-17 2020-12-24 株式会社ブリヂストン ランフラットタイヤ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5238040A (en) * 1990-09-14 1993-08-24 Pirelli Coordinamento Pneumatici S.P.A. Self-supporting carcass for motor-vehicle tires
US5851324A (en) * 1992-09-30 1998-12-22 The Goodyear Tire & Rubber Company Radial ply pneumatic tire
US20050133135A1 (en) * 2003-12-18 2005-06-23 Corvasce Filomeno G. Tire with sidewall having at least one internal rubber insert having graduated physical properties comprised of overlapping rubber segments

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6712108B1 (en) 1999-02-05 2004-03-30 The Goodyear Tire & Rubber Company Discontinuous ply for runflat tire construction
JP4053719B2 (ja) 2000-09-08 2008-02-27 住友ゴム工業株式会社 ランフラット性を向上したタイヤ
US7448422B2 (en) 2004-04-22 2008-11-11 The Goodyear Tire & Rubber Company Pneumatic run-flat tire

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5238040A (en) * 1990-09-14 1993-08-24 Pirelli Coordinamento Pneumatici S.P.A. Self-supporting carcass for motor-vehicle tires
US5851324A (en) * 1992-09-30 1998-12-22 The Goodyear Tire & Rubber Company Radial ply pneumatic tire
US20050133135A1 (en) * 2003-12-18 2005-06-23 Corvasce Filomeno G. Tire with sidewall having at least one internal rubber insert having graduated physical properties comprised of overlapping rubber segments

Also Published As

Publication number Publication date
JP2010137852A (ja) 2010-06-24
ZA200908859B (en) 2010-09-29
EP2196333A3 (de) 2013-08-28
CN101746226A (zh) 2010-06-23
EP2196333B1 (de) 2015-01-14
EP2196333A2 (de) 2010-06-16

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